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ARCHIVED REPORT
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Alaska Volcanoes Update

Friday, February 21, 1997, 10:30 AM AST (1930 UTC)



Pavlof Volcano: 55.42N, 161.9W 8,262 ft elevation

CURRENT LEVEL OF CONCERN CODE IS YELLOW



The eruptive pause at Pavlof Volcano is now beginning its eighth week.

AVO seismometers continue to record very low levels of seismicity

at the volcano. NWS observers in Cold Bay reported a small

steam plume up to 1000 feet above the summit vents last

weekend, and pilots reported on Wednesday a similar steam

plume 2000 to 3000 feet above the volcano.



Based on comparisons to other historical eruptions at Pavlof, it is

possible that this pause will persist for weeks or months,

followed by resumption of ash and lava emission with little or no

warning. Accordingly, AVO continues to monitor the volcano

closely and will issue further updates as the situation changes.



Pavlof is located 600 miles southwest of Anchorage. The nearest towns

to the volcano are Cold Bay (37 mi SW), King Cove (30 mi SW),

Sand Point (60 mi E), and Nelson Lagoon (50 mi NE). AVO has a

seismic network of six stations near the volcano.



Okmok Volcano: 53.4N, 168.17W; 2,500 ft elevation



The small eruption that began on the morning of February 13 from a

cone within Okmok caldera continued this week. A hot spot

was visible on satellite images throughout the week and pilots

reported an ash plume to 16,000 feet ASL on Tuesday, February

18. Observers 10 miles east of the volcano at the former Fort

Glenn military base reported seeing a red glow over the

caldera on Tuesday night. The volcano is not monitored

seismically. Okmok is located on the eastern end of Umnak Island,

75 miles southwest of Dutch Harbor. The nearest settlements

are Nikolski (45 miles W) and former Fort Glenn military base

(10 miles E).



Iliamna Volcano: 60.04N, 153.17W; 10,196 ft elevation

The seismic swarm that began on 1 August 1996 beneath Iliamna

Volcano appears to be diminishing. Earthquake count averages

have gradually decreased over the past several weeks. Only 2

located events were recorded this week.

VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.

AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].

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Page modified: May 27, 2014 10:23
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